Dovetailing machine



Oct. 20, TEAGUE DOVETAILING MACHINE 4 Sheets-Sheet 1 Filed June 17, 1940 Juventor: Mango a M. TEAGUE II II II I II In (Ittomegg Oct. 20, 1942. M. M. TEAGUE 2,299,602

DOVETAILING MACHINE Filed June 17, 1940 4 Sheets-Sheet 2 Fig 4 3maentor:

Mow/2a;- I I. Tsnau:

4 MO MM Oct. 0, 2. M. M. TEAGUE 2,299,602

DOVE'IAILING MACHINE Filed June 17, 1940 4 She ets-Shee t s Inventor MONROE M. TEAGU s- Gttorneg Oct. 20, 1942- M. M. TEAGUE DOVETAILING MACHINE 4 Sheet-Sheet 4 Filed Jun 17. 1940 Patented Oct. 20, 1942 UNITED STATES PATENT OFFICE 2,299,602 DOVETAILIN G MACHINE Monroe M. Teague, Lenoir, N. C.

1940, Serial No. 340,973

Application June 17,

Claims.

Heretofore, apparatus has been designed for cutting mortises and tenons in the edges of materials for this purpose, but due to the fact that a high degree of mechanical skill was necessary to properly guide the material about the cutting and tenons in the edges thereof simultaneously.

These boards are clamped together, after which they are positively rotated in a non-variable path about the cutting members so that every mortise and tenon will be cut in exactly the same manner. By providing two boards adjacent each other, fraying of the edges will be largely eliminated, because the boards or workpieces will travel in a complete orbit, thereby preventing the cutting tools from abruptly leaving the wood.

It is therefore, an object of this invention to provide a. woodworking machine which has a table mounted thereon for universal movement in a horizontal plane, which table is adapted to carry a workpiece and cause closed orbit about cutting tools for cutting mortises and tenons in the workpiece.

It is another object of this invention to provide an apparatus of the class described which has a carriage for confining the workpiece preparatory to moving the same into engagement with the cutting tool and which has means for normally pressing the confined workpiece out of engagement with the cutting tool. Further means are provided for clamping the workpiece and for simultaneously moving the same into engagement with the cutting tool, whereby the workpiece is initially set to the cutters before the cutting operation is begun.

It is another object of this invention to provide mortises therebetween. f

an apparatus of the class described comprising a carriage for rotating a workpiece in a preorbit about a cutting tool and having positive non-variable means for guiding the workpiece in said orbit.

This positive, non-variable means in the present instance, comprises a cam which is so mounted that the workpiece carried by the carriage will be caused to travel in one path only, thereby causing each and every tenon to be out exactly alike. Means are also associated with the present invention for automatically stopping the car riage and the workpiece after a revolution has be cut. This is a very important feature, because the machine should be stopped exactly in position for beginning the next cutting operation on succeeding workpieces. In other words, this automatic stopping feature eliminates the necessity of manually re-setting the machine to starting position.

Some of the objects of been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawings, in which- Figure 1 is a plan view of my improved woodworking apparatus;

Figure 2 is an edge view of a pair of boards in which mortises and tenons have been cut with the woodworking apparatus shown in Figure 1;

Figure 3 is an isometric exploded view showing the edge of the boards in Figure 2, with the tenons and mortises cut therein;

Figure 4 is an elevation taken along the line l-4 in the Figure 1;

Figure 5 is an elevation taken along the line 55 in Figure 1;

Figure 6 is an E6 in Figure 1;

Figure 7 is an isometric sectional detail view taken along the line 7-1 in Figure 1, showing the clutch and gear reducing arrangement for driving the woodworking carriage;

Figure 8 is a vertical sectional view taken along the line 8-8 in Figure 1;

Figure 9 is a sectional plan view taken along the line 9-9 in Figure 8, through the clutch and gear reducing arrangement for driving the carriage cam;

Figure 10 is a sectional plan view taken along the line l0l0 in Figure 8 showing other portions of the clutch and gear reduction mechanism for the carriage cam.

Figure 11 is a sectional view similar to the upper left-hand portion of Figure 8 but showing the workpieces confined in an unclamped nonthe invention having elevation taken along the line contacting position relative to the cutting members.

Cutter driving mechanism rality of vertically disposed shafts Hi rotatably mounted therein, each of said shafts having a spiraled pinion or gear i5 thereon. It will be noted by observing Figure 6 that the pinions i5 intermesh with each other and that the adjacent pinions have oppositely pitched teeth therein, which will cause adjacent shafts to rotate in opposite directions. In the present showing, two sets of meshing pinions, embodying five for each set are shown. However, it is to be understood that any number of sets may be employed, depending upon the size of the machine and the number of workpieces under construction.

One of the pinions iii in each set is adapted to mesh with a suitable gear ll on the upper end of a shaft 58, the lower end of shaft iii havinga beveled gear i9 fixed thereon which, in turn, meshes with a beveled gear 29 on a drive shaft 2!. Drive shaft 2| is rotatably mounted in the framework It! and has a driving pulley 22 on one end thereof. The upper end of each of the shafts it has a cutting tool 25 fixed thereon. As the shaft 21 rotates, rotary movement is transmitted to the shafts i i and the associated cutting tools 25 by virtue of the spiraled gears i5, pinion ll, shaft i3, and beveled gears i9 and 2t.

Woflcpiecc carriage mechanism A table member 2i is positioned adjacent the cutting tools 25. This table is supported by U- shaped brackets 28 (Figures 6 and 8), which, in turn, are secured to the frame H by means of a bolt til, said bolt being adapted to penetrate a slot '3! in the U-shaped member 28. An adjustment screw 32 is provided, which screw is threadably secured in one leg or" the U-shaped member 28 and has its lower end abutting an angle member 33 secured to the frame H. When it is desired to adjust the height of the table member 21, it is only necessary to manipulate the bolts til and 32.

The upper surface adapted to support or workpieces 35 and are out, leaving tenons in Figures 2 and 3 in a cutting operation. When the workpieces 35 and 3B are first placed upon the table member 21 they occupy a position shown in Figure 11, and in this position the workpieces are confined but not clamped between plate members 39 and ii}. A plate member it is loosely secured to a carriage casting ll by any suitable means such as a stud bolt 62. The lower end of plate member $8 is normally pressed away from the vertical face of the carriage casting M by means of suitable compression springs 43, which springs encircle the intermediate portion of stud bolts it. These stud bolts penetrate bores in the lower edges of the plate 49 and the springs it normally force this lower edge against the head of the bolts. In other words, when the springs 33 are expanded as shown in Figure 11, the cutting tools 25 are covered by the lower edge of the plate so and therefore of the table member 21 is the lower edges of boards 38, in which mortises 3T 38 in the manner shown the workpieces 35 and 36 cannot engage these cutting tools. However, when the plate member 39 is pushed to the right in Figure 11 to clamp the boards 35 and 36 against the face of plate member 46, then the plate member 40 will be pushed to the right in a parallel or vertical position, thereby compressing the springs 43 and at the same time moving the lower edge of the board 35 into contact with the cutting tools 25 to the position shown in the upper portion of Figure 8. This movement will set the workpiece 35 and its companion workpiece 35 to the cutting tools so that the initial entry of the cutters will be made.

The means for clamping the plate 39 against the workpiece 56 comprises an eccentric roller 01 shaft 48, which shaft has its restricted ends rotatably mounted in the ends of the rods 9, said rods having their other ends anchored in bosses 56 of carriage casting 4!. Suitable compression springs 5! are disposed around the bolts 49 between the bosses '50 and the plate 39. Also a handle 52 is provided on the end of the eccentric shaft is for the manipulation of the clamping means. When it is desired toclamp the plates 39 firmly against the workpiece 36 and thereby force the companion workpiece 35 and the plate so to a vertical position as shown in Figure 8, it is only necessary to turn the handle 52.

Workpiece gauge In order to properly position the workpieces 35 and 36 laterally of the framework between plates 3t and 43, a suitable L-shaped guide or stop til has been provided. This stop 66 is adapted to be adiustably secured on the top edge of the plate it by means of a stud bolt 6!, said stud bolt penetrating a slot 62 in the horizontal leg portion of stop 58 and having its lower end threadably embedded in one of the spaced holes 83 in the top of the plate to. The stop 60 has a depending leg portion against which the vertical side-edges of the workpieces 35 and 36 are adapted to rest. Before the workpieces are inserted between the plates 39 and 40, the stop 69 is adjusted to the proper position so that each of the cutters 25 will engage the workpieces at the proper position when the cutting of the mortises and tenons is effected. The purpose of providing a series of holes 63 is to allow a greater latitude of adjustment. It is obvious that one or more brackets Bil may be employed. Also one or more sets of boards or workpieces 35 and 36 may be placed in between the plates 39 and 56 for simultaneous operation. In the present instance only one set of boards and only one stop is shown.

Carriage The carriage casting M which supports the workpieces 35 and 36 is in turn mounted upon a base or table member 65. This base member has dove-tailed portions 51 integral with its opposed sides which fit into dove-tailed grooves 68 in an apron member 69, said apron member 69 being slidably mounted for transverse movement of the framework l0 upon a cross piece iii. The dove-tailed connection designated by reference characters 6] and 68 permits longitudinal sliding movement of the carriage casting ll and base 66 relative to the framework of the machine, and the cross pieces 10 and the apron 69 permit the transverse movement. It is therefore, seen that the workpieces, when properly clamped between plates 39 and 48, can

be moved universally in a horizontal plane relative to the stationary cutting tools 25. The path or orbit travelled by the workpieces 35 and 36 is shown by dot-dash line designated by reference character 12 in Figure 2.

It is very desirable that the path of travel of the workpieces 35 and 36 be followed exactly so that the tenons 38 and mortises 31 in the edges of the workpieces will be cut identical and precise. In other words, positive, non-variable means for guiding the workpiece in a predetermined orbit about the cutting tool must be pro vided. Heretofore, tables have been universally mounted for carrying a workpiece similar in many respects to the above described mechanism, but so far as I am aware none have provided a non-variable positive guiding means for directing the workpiece to travel through a predetermined orbit, as has been'provided in this case.

Workpiece and carriage moving mechanism The base member 66 has a horizontally disposed lug 15 integral therewith, which lug is threadably penetrated by a bolt 16. This bolt has a smooth tip on its lower end which penetrates a hole 11 (see Figure 7) in cam member 18. The periphery of the cam member 18 is such that the proper longitudinal movement of the base member 65, carriage casting 4i and the clamped workpieces will be imparted during a revolution. This cam 18 is fixedly secured to a rotary cylinder member 19 by any suitable means such as bolts 80, said bolts being adapted to penetrate the cam 18 and the member 19 and to have their lower ends secured in a plate member 8| resting directly beneath the member 19 (see Figure 8). The cylindrical member 19 is loosely mounted around the upper end of a shaft 82 and this shaft 82 projects downwardly through a hole 83 in the plate 8|, just described, and also through the central portion of housing 84. The lowermost projecting end of the shaft 82 has a gear 81 fixedly mounted thereon which gear meshes with a pinion 83 of motor 89, said motor, in turn, being mounted on a bracket 99 and this bracket is supported by the lower face of housing 84. Housing 84 has a cover 95 secured thereon by means of screws 96. The central portion of the cover has an enlarged hole 91 therein, which hole is concentric with the shaft 82 and the hole 83 in the plate 8I immediately therebelow. The cover 95 is threadably engaged by the lower ends of suitable bolts 99. These bolts extend upwardly through a casting IOI, said casting having suitable flanges I integral with opposed sides thereof which rest upon a bracket I82. It is therefore seen that as the cam 18 rotates from the high side to the low side or vice versa, that the casting IOI together with the parts therebelow will move back and forth longitudinally an amount corresponding to the difierence between the radii from the center of the shaft 82 to the high and low sides of the cam.

It will also be noted that the bolt hole 11 is placed off-center relative to the drive shaft 82; consequently, as the cam 18 is rotated, the base member 66, together with the apron member 69 will be moved transversely of the machine on cross piece 16, thereby giving transverse movement to the work pieces 35 and 36 at the same time longitudinal movement is imparted.

The bracket I62 is secured to the central portion of the cross piece by any suitable means such as stud bolts I85. Extending from opposed sides of the stationary bracket I02 are lugs I86 in which the ends of bolts I 01 are threadably secured. The bolts extend horizontally and are adapted to slidably penetrate another set of lugs I09 which are integral with the casting IOI. Disposed upon bolts I01 and between the lugs I09 and the lugs I06 springs IIO, these compression springs normally tending to force the cam 18, member 19 and casting I M to the left in Figure 1, against a stationary roller H2.

The roller H2 is secured on the of an angle member 4. This same horizontal leg has a slot II 5 therein which is penetrated by a stud bolt H6 and this bolt has its lower end threadably secured in the bracket I022. The vertical leg of the angle member H4 is penetrated by stud bolt II 1 which likewise has its end threadably secured in the bracket I62. When it is desired to adjust the position of the carriage and'clamped workpiece relative to the cutters 25, the screws H6 and I I1 are manipulated to perform this adjustment. Adjustment of the compression offered by springs Hi! can be effected by the manipulation of the nuts I 91a which are threadably secured around the bolts I01. These nuts serve to confine one end of each compression spring II 0 whereas the lugs I99 serve to confine the other ends.

By observing Figure 4, it will be seen that the apron portion 69 is cut away as at 6911 a sufficient amount to allow transverse reciprocation of the apron member on the cross-piece 10 without engaging the bracket I 02 which is secured to the same cross piece.

It will be noted by observing Figures 7 and 8, that the cylindrical member 19 and the cam 18 are not directly secured to the shaft 82 because the upper end of shaft 82 is rotatably mounted within the cylindrical member 19 and the upper end of the shaft terminates short of the cam 18. The shaft 92, however, is connected to the cam 18 indirectly by means of a train of gears which will be presently described.

As heretofore stated, the

horizontal leg plate 8I in the housing 84 is secured to the members 18 and 19 by means of bolt 80. This cylindrical plate member 8I has suitable bores therein which are loosely penetrated by pins II9, said pins projecting upwardly from a circular internal gear plate I25, This gear plate rests upon another gear plate I26 immediately therebelow and the teeth of both of the gears I25 and I26 are adapted to simultaneously mesh with pinions I29, these pinions being rotatably mounted upon studs I30 which extend upwardly from a, plate yoke I3I, The plate yoke I3I is disposed directly below the internal gear plate I26 and is fixedly secured as at I32 to the shaft 82. It should be stated that the internal gear I25 has a different number of teeth therein than the gear I26 therebelow; consequently when the lowermost gear segment I26 is held in stationary position and when the shaft 82 is set in motion to rotate the pinions I29, the top gear will be caused to rotate slowly as a result. As soon as the top gear begins to rotate, the plate 8I, bolts 80, cylindrical member 19 and cam 18 will simultaneously begin to rotate, thereby imparting universal movement in a horizontal plane to the workpiece clamping means thereabove.

Starting and stopping mechanism are suitable compression top gear I will be held in stationary position due to the friction offered by the parts of the machine operated thereby and the bottom gear will becaused to rotate. Since the bottom gear is not secured to the cam IS in any manner, its rotation will not affect the operation of the machinery and as a result the carriage and workpieces will remain stationary.

In order to hold the lower gear I26 in a stationary position to cause the cam I8 to rotate, this gear has been provided with suitable notches or teeth I38 in its periphery. These teeth are adapted to be engaged by a wedge shaped end I39 which forms a part of a plunger I46, said plunger being slidably mounted in a pipe MI and this pipe communicates with the interior of the housing 84 (see Figure 10). The periphery of the plunger Iii is engaged by a friction member I42 in a pipe I63. Also disposed in the pipe M3 is a spring I45 which normally presses the friction member I62 in engagement with the member I45. The resistance offered by the friction member M2 may be varied by a set screw I46 which is threadably secured in the pipe I63 and which applies pressure to the spring, and the spring, in turn, applies pressure to the friction member.

Shaft E46 extends outwardly from the pipe member M I, and the end thereof is adapted to be engaged by a cam member I56 on the lower end of a lever I5I. This lever is fixedly secured on a shaft I52 said shaft also having an upwardly extending lever I53 fixed thereon with a handle I54 on the upper end of the lever. A spring I56 normally tends to rotate the cam member I50 out of engagement with the projecting end of shaft I46. Stop member I55 limits the clockwise rotation of these levers.

When it is desired to start the machine, it is necessary to rotate the cam member I53 toward the observer in Figure l, or in counterclockwise manner in Figure 5, thereby causing this cam member to push the shaft I46 inwardly toward the housing 84. This movement, in turn, will cause the pointed end I39 to engage teeth I38 in the periphery of the lower internal gear I26.

It should be stated here that the function of the two internal gears and the pinions I29 is to effect a gear reduction between the motor 69 and the cam 16 and also to provide a simple clutch arrangement. Cam I8 should rotate relatively slow in comparison to the high speed of the electric motor 89 and hence this type of gear reduction is employed.

When successive sets of workpieces are being rapidly cut by the above-described invention, it is highly important that the machine be automatically stopped exactly in the right position when the workpieces have travelled the path of a closed orbit. To effect this automatic stopping, it is necessary to withdraw the plunger point I39 and the shaft I43 from engagement with the teeth I38 in the lower gear I26. Integral with the shaft I and directly above the plunger point I39 is a second beveled point I66, said point being adapted to project inwardly substantially the same distance as the point I35. This beveled point is turned in the opposite direction from the beveled surface on the point I39, and is disposed, when pushed inwardly, in a suitable groove I6I cut in the lower periphery of the internal gear I25. The gear plate I25 has pivoted therein as at I62 a dog I63 said dog having its point also extending into the groove I6I. A plunger I65 engages the back side of the dog I63 and this plunger is normally pressed against this dog by means of a spring I66. With the free end of the dog I63 disposed in the groove I6I, it is seen that as the gear I25 rotates that this dog I63 will engage the beveled projecting end I66 and force the shaft I43 outwardly and at the same time, the point I39 will be disengaged from the teeth I38 in the gear I26 therebelow. With both of the internal gears disengaged, the lower gear will start rotating and the upper gear, to which the cam I8 is attached, will remain stationary. At the time the dog I63 engages the point I66 to stop the cam 18 from rotating, the workpieces 35 and 36 will have completed their travel of the orbit. Therefore, the carriage and clamping means will be stopped in the proper position for the beginning of a cutting operation upon the next succeeding pair of workpieces.

It is, therefore seen that a positive non-variable means has been provided for forming the tenons 33 simultaneously by cutting the mortises 31 therebetween in the workpieces 35 and 36. If it is desired to change the type or size of tenons and mortises in the workpieces, it is only necessary to remove the cam 18 and replace it with the desired cam. This type of construction makes the machine fully automatic after the workpieces have once been clamped in position for cutting. It also insures that each and every workpiece will be cut in an identical manner without depending upon any degree of mechanical skill for performing a first-grade piece of workmanship.

In the drawings and specification there has been set forth a preferred embodiment of the in vention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation. the scope of the invention being set forth in the claims.

I claim:

1. A woodworking machine for cutting mortises and tenons in a workpiece, comprising a base, a table mounted for movement on the base in any direction in substantially a horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, means for loosely confining a workpiece preparatory to moving the same into engagement with the cutting tools, spring means for normally urging said workpiece out of engagement with the cutting tools, and means for clampin the workpiece and for simultaneously moving the same into engagement with the cutting tools whereby the workpiece is initially set to the cutting tools so that the initial entry of the cutters will be made while the cutting tools are in stationary position, and prior to cutting the mortises and tenons.

2. A woodworking machine for cutting mortises and tenons in a workpiece, comprising a base, a table mounted for movement on the base in any direction in substantially a horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, means for loosely confining a workpiece preparatory to moving the same into engagement with the cutting tools, resilient means for normally urging said workpiece out of engagement with the cutting tools, means for clamping the workpiece and for simultaneously moving the same into engagement with the cutting tools whereby the workpiece is initially set to the cutting tools prior to cutting the mortises and tenons, positive nonvariable means for guiding the workpiece in a predetermined orbit about the cutting tools, and means for automatically stopping said guiding means after the orbit has been traveled by the workpiece.

3. A device of the character described comprising a base, a connecting member, a table, means for slidably mounting the table upon the connecting member whereby reciprocating movement is obtained, means for slidably mounting the connecting member upon the base whereby reciprocating movement is had, such movement being substantially at right angles to the path of the aforesaid movement, a revolving cutter mounted on the base, clamping means on said table adapted to receive and maintain pieces of wood or the like above the plane of movement of the table, a positive non-variable means for guiding the workpiece in a predetermined orbit about said cutter, said guiding means including a driven shaft, an eccentric cam mounted on said shaft with one side of its periphery engaging the stationary base, and a connection eccentric to said shaft between said cam and said table.

4. A woodworking machine for cutting mortises and tenons in a workpiece comprising a base, a table mounted for movement on the base in any direction in a substantially horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, clamping means on said table to receive the workpiece to be acted upon and to hold it in the plane of the cutting tools, positive non-variable means for guiding the workpiece in a predetermined orbit about the cutting tools, said guiding means including a driven shaft, an eccentric cam mounted on said shaft with one side of its periphery engaging the stationary base, and a connection eccentric to said shaft between said cam and said table.

5. A woodworking machine for cutting mortises and tenons in a workpiece comprising a base, a table mounted for movement on the base in any direction in substantially a horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, clampin means for said table to receive a workpiece to be acted upon and to hold it in the plane of the cutting tool, a motor slidably mounted in said machine for movement toward and away from said cutting tools, cam means driven by said motor and engageable with said table and with said machine, whereby the r table will be moved toward and away from the cutting tools, and an eccentric connection between the axis of rotation of said cam and said table whereby the table is simultaneously moved transversely of the path of said first-named movement.

6. In a dovetailing machine, a base, a pair of frames mounted one upon the other for sliding movement along a trackway disposed at right angles to each other, said frames being supported by said base, a plurality of rotary cutting tools, means on one of the frames for holding the workpiece, a motor slidably mounted on the other frame, and means driven by the motor and operatively engaging the frame for moving the pieces of wood in a closed orbit around the cutters, said frame engaging means including a driven shaft, an eccentric cam mounted on said shaft with one side of its periphery engaging the base, and a connection eccentric to said shaft between said cam and said table.

7. In a machine for simultaneously cutting mortises and tongues on the end of two pieces of material and provided with a table slidable longitudinally of the machine, a second table mounted on the first table for sliding movement at right angles to the direction of sliding movement of the first table, a plurality of vertically disposed spaced cutting tools, means on the second table for supporting the two pieces of material, a motor slidably mounted on said machine for movement toward and away from said cutting tools, cam means driven by said motor and engageable with said machine and with said second table, whereby said second table will be moved toward and away from said cutting tools and an eccentric connection between the axis of rotation of said cam and said second table whereby the table is simultaneously moved transversely of the path of said first-named movement.

8. A woodworking machine for cutting mortises and tenons in a workpiece comprising a base, a table mounted for movement on the base in any direction in a substantially horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, clamping means on said table to receive the workpiece to be acted upon and to hold it in the plane of the cutting tools, a motor slidably mounted on said machine for movement toward and away from said cutting tools, a shaft driven by said motor, a rotatable pinion bodily rotatable about said shaft, a pair of superposed rotatable gears having substantially the same pitch diameter but having a diiferent number of teeth therein, both of said gears being adapted to mesh with said pinion as it bodily rotates, cam means connected to one of said gears and being engageable with said table and with said base, means for releasably holding the other of said gears stationary, whereby the table will be moved toward and away from the cutting tools and an eccentric connection between the axis of rotation of said cam and said table and whereby the table is simultaneously moved transversely of the path of said first-named movement.

9. A woodworking machine adapted to cut mortises and tenons in workpieces comprising a stationary revolving cutter, a table slidably mounted for movement toward and away from said cutter, a plate having its upper portion pivotally secured to said table above the cutter and having its free lower end terminating adjacent but above said cutter, spring means for urging the free end of said plate away from said table, and means for clamping a workpiece against one face of said plate and for simultaneously moving the free end of the plate toward said table to thereby press one edge of the workpiece against said cutter.

10. A woodworking machine for cutting mortises and tenons in a workpiece comprising a base, a table mounted for movement in the base in any direction in a substantially horizontal plane, rotary cutting tools mounted in a stationary position adjacent said table, a plate having its upper edge pivotally secured to said table and having its free edge terminating adjacent but above said cutting tools, resilient means for urging the free edge of said plate away from said table, a clamp for holding said workpiece against one face of said plate and for simultaneously holding the free edge of the plate against the table to thereby press one edge of the workpiece against said cutting tools.

MONROE M. TEAGUE. 

